Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]
Balance at Dec. 31, 2017	$ 123,453	$ 424	$ 114,302	$ 8,727
Balance (in shares) at Dec. 31, 2017		42,398,140
Issuance of common stock upon exercise of stock options and warrants	17	$ 0	17	0
Issuance of common stock upon exercise of stock options and warrants (in shares)		5,000
Value of share-based arrangements	26	$ 0	26	0
Value of share-based arrangements (in shares)		0
Net loss	(3,056)	$ 0	0	(3,056)
Balance at Mar. 31, 2018	120,440	$ 424	114,345	5,671
Balance (in shares) at Mar. 31, 2018		42,403,140
Balance at Dec. 31, 2018	69,213	$ 426	115,719	(46,932)
Balance (in shares) at Dec. 31, 2018		42,602,431
Value of share-based arrangements	377	$ 0	377	0
Value of share-based arrangements (in shares)		0
Net loss	(4,039)	$ 0	0	(4,039)
Balance at Mar. 31, 2019	$ 65,551	$ 426	$ 116,096	$ (50,971)
Balance (in shares) at Mar. 31, 2019		42,602,431